#box1{
    width: 100px;
    height:100px;
    background-image: url(./react.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%; 
}
#box2{
    width: 200px;
    height:200px;
    background-image: url(./react.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%; 
}
#box3{
    width: 300px;
    height:300px;
    background-image: url(./vue.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%; 
}